Nano silver wire flexible transparent conductive film with high lapping efficiency and excellent bending resistance

Abstract

The invention discloses a nano silver wire flexible transparent conductive film with high lapping efficiency and excellent bending resistance. The flexible transparent conductive film is prepared by firstly coating the surface of a substrate with nano silver wire conductive ink to form a conductive layer, then coating the surface of the conductive layer with an optimization liquid for optimization, and finally coating the surface of the optimized conductive layer with a UV protective liquid to form a UV protective layer. The nano silver wire surface PVP of the flexible transparent conductive film of the invention is removed, and the nano silver wire network nodes are soldered so that it requires a small number of nano silver wires to prepare the conductive film. The obtained conductive film has excellent optical performance, low square resistance, and excellent bending resistance, and is suitable for large-size display and flexible display.

Description

technical field [0001] The present invention relates to the field of electronic display, in particular to a nano-silver wire flexible transparent conductive film with high lapping efficiency and excellent bending resistance. The conductive film has the characteristics of excellent optical performance, low square resistance and excellent bending resistance, especially Suitable for large size display and flexible display. Background technique [0002] As the electronic display industry develops towards large sizes, the demand for transparent conductive films with good conductivity and high light transmittance continues to increase; at the same time, due to the development of flexible displays, higher requirements are placed on the flexibility of transparent conductive films. At present, the ITO (indium tin oxide) transparent conductive film, which is used in the largest amount in the market, has the problems of high square resistance and poor flexibility, and is not suitable f...

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Problems solved by technology

[0003] The contact resistance at the nodes of the silver nanowire network in the flexible transparent conductive film of silver nanowires determines the conductivity of the final conductive film. Therefore, researchers have also conducted a lot of research on reducing the contact resistance at the network nodes of the silver nanowires, mainly Use thermal welding, optical welding, chemical welding and other methods to process, but these methods currently have certain problems, such as: thermal welding requires high temperature treatment, which is not suitable for flexible substrates such as PET that are not resistant to high temperatures; optical welding equipment is complicated, welding Low window, not suitable for roll-to-roll operation; chemical welding has limited effect due to the presence of PVP on the silver wire surface

On the other hand, since the mass-produced nano silver wires currently used in the market are basically produced by the alcohol reduction method, it is necessary to add a stabilizer and a structure-directing agent PVP. Although the silver wires have been cleaned after synthesis, considering the cleaning cost and The storage stability of the nano-silver wire solution after cleaning, the final surface of the nano-silver wire still contains a large amount of PVP, so that the contact resistance of the prepared conductive film at the nodes of the nano-silver wire network increases, and the electrical properties of the conductive film deteriorate

At the same time, there is only a single physical contact at the node of the silver nanowire network, the compactness is poor, and the bending resistance needs to be further improved

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